Table 3.

Adjusted odds ratio (OR) of lower and high day 3 delivered tidal volume for closed compared with open model intensive acre units (ICUs)

Covariate*	Adjusted OR for outcome (day 3 tidal volume†)
	≤ 6.5 mL/Kg		< 8 mL/Kg		≥ 12 mL/Kg
	OR	95% CI	OR	95% CI	OR	95% CI
ICU model
Closed	2.23	1.09–4.56	2.09	1.19–3.65	0.30	0.17–0.55
Open	1.00	Referent	1.00	Referent	1.00	Referent

* adjusted for age, gender, Acute Physiology Assessment and Chronic Health Evaluation (APACHE) III at acute lung injury (ALI) onset, ALI risk factor, operative status of patient, chest x-ray severity at ALI onset, academic status

† Kg predicted body weight or measured body weight if height not measured